Goto https://app.chime.aws. Sign in or join your meeting.
Toggle the shortcut panel using ⌘+/ on macOS or Ctrl+/ on Windows or Linux
For a list of keyboard shortcuts for the desktop and mobile applications see https://amazonchime.zendesk.com/hc/en-us/articles/38958405328411-Keyboard-Shortcuts-on-Windows-or-macOS-clients